CN116573895A - Self-compacting concrete and preparation method thereof - Google Patents

Self-compacting concrete and preparation method thereof Download PDF

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Publication number
CN116573895A
CN116573895A CN202310676771.1A CN202310676771A CN116573895A CN 116573895 A CN116573895 A CN 116573895A CN 202310676771 A CN202310676771 A CN 202310676771A CN 116573895 A CN116573895 A CN 116573895A
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self
parts
compacting concrete
compacting
aggregate
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王文
董晓朋
李泽群
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Dongguan Jianye Concrete Co ltd
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Dongguan Jianye Concrete Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/06—Quartz; Sand
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/42—Glass
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/12—Waste materials; Refuse from quarries, mining or the like
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/18—Waste materials; Refuse organic
    • C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
    • C04B18/248—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork from specific plants, e.g. hemp fibres
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/18—Waste materials; Refuse organic
    • C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
    • C04B18/26—Wood, e.g. sawdust, wood shavings
    • C04B18/265—Wood, e.g. sawdust, wood shavings from specific species, e.g. birch
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
    • C04B24/42—Organo-silicon compounds
    • C—CHEMISTRY; METALLURGY
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    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
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Abstract

The application relates to the field of concrete, in particular to self-compacting concrete and a preparation method thereof. The material comprises the following raw materials in parts by weight: 160-250 parts of self-compaction admixture, 600-1000 parts of coarse aggregate, 350-800 parts of medium aggregate, 500-800 parts of fine aggregate, 150-180 parts of cement, 80-150 parts of water, 2-3 parts of retarder and 30-40 parts of water reducer. The self-compacting concrete slurry obtained by compounding the self-compacting admixture, the coarse aggregate, the medium aggregate, the fine aggregate, the cement, the water, the retarder and the water reducing agent has better fluidity, segregation resistance, self-filling property and the like, and after the self-compacting concrete slurry is used for curing a bridge, the formed bridge has stable structure, is not easy to crack and collapse, and reduces the maintenance frequency.

Description

Self-compacting concrete and preparation method thereof
Technical Field
The application relates to the field of concrete, in particular to self-compacting concrete and a preparation method thereof.
Background
Self-compacting concrete (SCC for short) mainly depends on dead weight, can fill a mould without vibrating and wraps reinforced concrete, can pour and form a structure with complex shape, thin wall and dense reinforced concrete, increases the degree of freedom of structural design, greatly shortens the time required for concrete pouring, greatly reduces the labor intensity of workers, improves the construction progress, has good construction performance, can be built according to the shape of a building, and improves the degree of freedom of building. Self-compacting concrete is therefore commonly used for the construction of house buildings, bridges, trestle, flower nursery guardrails, road surfaces, etc.
With the development of science and technology, the society is rapidly developed, vehicles are increased, and therefore traffic flow and traffic flow are increased, particularly, bridges are increased, and although most of the bridges adopt limited running or limited traffic flow, the existing self-compacting concrete is used for bridge decks, and the phenomenon of easy cracking and partial collapse is still caused, so that the bridge decks are uneven, potential safety hazards exist, and the frequency of maintaining the self-compacting concrete is increased.
Disclosure of Invention
In order to reduce the possibility of cracking and collapsing of a bridge and reduce the maintenance frequency of a bridge deck, the application provides self-compacting concrete and a preparation method thereof.
In a first aspect, the application provides self-compacting concrete, which comprises the following raw materials in parts by weight:
160-250 parts of self-compacting admixture
600-1000 parts of coarse aggregate
350-800 parts of medium aggregate
500-800 parts of fine aggregate
150-180 parts of cement
80-150 parts of water
Retarder 2-3 parts
30-40 parts of water reducer.
The composition of the raw materials and the weight part range of the raw materials are all selected preferably, and the obtained self-compaction, fluidity, segregation resistance, self-filling property and the like are good. When the self-compacting concrete is used for building a bridge, the phenomenon of cracking and collapsing of the bridge deck of the bridge is reduced, and the frequency of bridge deck maintenance is reduced.
The coarse aggregate, the medium aggregate and the fine aggregate are adopted for compounding and use, so that the coarse aggregate, the medium aggregate and the fine aggregate are mutually embedded, the structural compactness of the self-compacting concrete after coagulation is improved, the strength of the self-compacting concrete is further improved, the phenomenon that the self-compacting concrete cracks and collapses after being used for a bridge deck is reduced, and the frequency of bridge deck maintenance is reduced.
Cement forms cement slurry under the action of water, and the cement slurry can stably adhere coarse aggregate, medium aggregate, fine aggregate and the like in a self-compacting concrete raw material system when the cement is solidified, so that the structural stability of the self-compacting concrete after being coagulated is further improved, and the possibility of cracking and sinking of the self-compacting concrete is reduced.
The reducing agent is a concrete additive which can reduce the mixing water consumption under the condition of maintaining the slump of the concrete basically unchanged, can disperse cement particles, can improve the workability, reduce the unit water consumption of cement and improve the fluidity of the mixture of self-compacting concrete; meanwhile, the unit cement consumption can be reduced, and the cement is saved. And the structure connection of the self-compacting concrete after condensation is more compact, the compressive strength of the self-compacting concrete is improved, and when the self-compacting concrete is used for building a bridge, the crack resistance and collapse resistance of the bridge deck can be improved, and the frequency of bridge deck maintenance is reduced.
The retarder is used for reducing the hydration speed and hydration heat of cement or gypsum, prolonging the setting time, and can be used together with a water reducing agent to further improve the structural stability of self-compacting concrete after setting.
The self-compaction admixture is a concrete admixture, can improve the fluidity and filling property of self-compaction concrete, can also improve the uniform distribution of coarse and fine aggregates, keeps the uniformity of a self-compaction concrete structure, ensures that cement, aggregates and reinforcing steel bars have good adhesion, further improves the structural stability of the self-compaction concrete after coagulation, reduces the phenomenon of cracking or collapsing when being used for bridges, and reduces the frequency of bridge deck maintenance.
In conclusion, the self-compaction concrete slurry obtained by compounding the self-compaction admixture, the coarse aggregate, the medium aggregate, the fine aggregate, the cement, the water, the retarder and the water reducing agent has better fluidity, segregation resistance, self-filling property and the like, and after the self-compaction concrete slurry is used for curing a bridge, the formed bridge has stable structure, is not easy to crack and collapse, and reduces the frequency of bridge deck maintenance.
Preferably, the self-compaction admixture comprises the following raw materials in parts by weight:
35-55 parts of inorganic filler
50-80 parts of fibrous filler
5-10 parts of organosilicon waterproofing agent
70-105 parts of water.
The organic silicon waterproof agent is water-based organic silicon waterproof agent, and can also play roles of retarder, water reducer and reinforcing agent when being mixed into cement mortar, so that the structural stability of the self-compacting concrete after being coagulated is further enhanced.
The inorganic filler and the fiber filler can further improve the filling compactness of the self-compacting concrete, so that the coagulated structure is more stable, and the phenomenon of collapse of the bridge is reduced when the self-compacting concrete is used for the bridge.
In conclusion, through inorganic filler, fibrous filler, organosilicon waterproofing agent and water complex formulation, can further improve mobility, self-filling nature, the self-compaction nature of self-compaction concrete, when it is used in the bridge, the structure after the setting is more stable, and then reduces the bridge floor and appears splitting, subsides possibility, reduces the frequency of bridge floor maintenance.
Preferably, the inorganic filler is prepared from fly ash, mineral powder and silicon micropowder in a weight ratio of 1 (1.8-2.5): (2.5-3.3).
The fly ash particles are in a porous honeycomb structure, have high specific surface area and high adsorption activity, the bead wall has a porous structure, the porosity is as high as 50% -80%, and the fly ash particles have high water absorbability, so that when the fly ash particles are used in self-compacting concrete, a large amount of cement and fine aggregate can be further saved, the water consumption is reduced, the raw materials of the concrete are easy to mix, the pumpability and self-filling property of the concrete are enhanced, the heat of hydration and the thermal energy expansibility are reduced, the strength of the self-compacting concrete after being coagulated is improved, and the possibility of cracking and collapsing of the self-compacting concrete is reduced.
The mineral powder is used for self-compacting concrete, can reduce hydration heat of the concrete, improve workability of the concrete, reduce segregation and bleeding, reduce temperature difference change and internal stress of the concrete with large volume, and inhibit cracks generated by the temperature difference.
The silica powder is filled into the self-compacting concrete and can be filled into gaps among the frameworks, so that the compactness of the self-compacting concrete is improved.
In conclusion, the self-compacting concrete has better self-compacting property through the compound use of the fly ash, the mineral powder and the silica powder, so that the structure of the self-compacting concrete after condensation is more stable, and when the self-compacting concrete is used for building a bridge deck, the possibility of collapse and cracking of the bridge deck is reduced, and the frequency of bridge deck maintenance is reduced.
Preferably, the fibrous filler is prepared from banana fiber, sisal fiber and glass fiber in a weight part ratio of (4.2-6.5): (2.3-3.8):1.
Banana fiber has softness, water absorption and toughness, while sisal fiber has better toughness, tensile strength, water absorption and the like, but is harder than rubber fiber; the inorganic nonmetallic material with excellent glass fiber has the advantages of strong heat resistance, good corrosion resistance and high mechanical strength, when the banana fiber, the sisal fiber and the glass fiber are mixed according to the weight ratio of (4.2-6.5): (2.3-3.8) 1) when the self-compacting concrete is used in the self-compacting concrete, the structural stability of the self-compacting concrete after the concrete is coagulated can be further enhanced, and when the self-compacting concrete is used on the bridge deck of the bridge, the possibility of cracking and collapsing of the bridge deck of the bridge can be further reduced, and the frequency of bridge deck maintenance is reduced.
Especially in some hot summer areas or in drought seasons, the phenomenon of dry cracking of the bridge deck is increased in long-term sunshading, and the phenomenon of dry cracking can be relieved by sprinkling water, but the labor cost is high.
The banana fiber and the sisal fiber are adopted to absorb water to enhance the toughness of the self-compacting concrete, so that the possibility of cracking of the self-compacting concrete is reduced, meanwhile, after the banana fiber, the sisal fiber and the glass fiber are compounded, the self-compacting concrete is mixed to form a fiber net, and the fiber net is flexibly combined, so that the structure of the concrete has buffering capacity, the cracking resistance and the compression resistance of the concrete are improved, the phenomenon of cracking or collapsing of a bridge deck is further reduced, and the frequency of bridge deck maintenance is reduced.
Preferably, the fibrous filler is surface-treated with a surface treatment agent.
In order to further improve the mixing uniformity of the fibrous filler and the self-compacting concrete raw material system, the surface of the fibrous filler is further treated. The fiber net with stable structure is formed after the fiber net is filled into self-compacting concrete, so that the structural stability of the self-compacting concrete after coagulation is improved. When the bridge is used for bridge deck construction, the possibility of cracking or collapsing on the surface of the bridge is reduced.
Preferably, the surface treatment agent comprises the steps of:
step 1: according to parts by weight, 7.5-12 parts of chitosan is weighed and dissolved in N, N-dimethylformamide, the mixture is heated to 65-75 ℃, 1.5-3 parts of salicylic acid is dropwise added under stirring at the rotating speed of 200-300r/min, after the dropwise addition is completed, the reaction is carried out for 3.5-4.5 hours, the stirring is stopped, the mixture is kept stand for 30-60 minutes, the mixture is filtered, and the mixture is washed by absolute ethyl alcohol and dried to obtain a salicylic acid-chitosan compound;
step 2: according to the weight portions, 2.8 to 4.7 portions of the salicylic acid-chitosan compound obtained in the step 1 and 8 to 13 portions of PVP solution with the mass fraction of 1.3 to 1.8 percent are weighed and evenly mixed, and then 1.8 to 3.3 portions of N-aminoethyl-gamma-aminopropyl trimethoxysilane are added and stirred for 15 to 25 minutes to obtain the surface treating agent.
The banana fiber and the sisal fiber are natural fibers, so that the ageing phenomenon can occur after long-term use, the ageing phenomenon is accelerated under the condition of burst, and the banana fiber and the sisal fiber are particularly used for bridges. Therefore, the surface treatment agent is used for carrying out surface modification, and a coating film is formed on the surface of the fiber, so that the filling property of the fiber in self-compacting concrete can be improved, and the possibility of ageing of banana fiber and sisal fiber can be reduced.
Specifically, the application uses N, N-dimethylformamide as a solvent to dissolve chitosan, and then salicylic acid is added, and the carboxyl of the salicylic acid and the amino of the chitosan undergo a grafting reaction to obtain the salicylic acid-chitosan compound. Because salicylic acid and chitosan have the effect of ultraviolet resistance, the grafted chitosan also has better ultraviolet resistance and solubility.
Further, salicylic acid-chitosan is further compounded with PVP (polyvinyl pyrrolidone) and N-aminoethyl-gamma-aminopropyl trimethoxysilane, PVP is polyvinylpyrrolidone, and the PVP has better adhesiveness and film forming property, and N-aminoethyl-gamma-aminopropyl trimethoxysilane is a coupling agent and has coupling effect, and meanwhile, the water resistance, the heat resistance, the adhesiveness and the like of the coupling agent can be improved.
Therefore, after salicylic acid-chitosan, PVP and N-aminoethyl-gamma-aminopropyl trimethoxy silane are compounded, the obtained surface treating agent has better film forming property and adhesiveness, and after the surface treating agent is used for treating the fiber filler, a stable coating film is formed on the surface of the fiber filler, so that the fiber filler is easy to be fully and uniformly mixed with a raw material system of self-compacting concrete, the cracking resistance and the dent resistance of the self-compacting concrete after being coagulated are improved, and when the surface treating agent is used for a bridge deck, the possibility of cracking and collapsing of the bridge deck can be reduced, and the frequency of bridge deck maintenance is reduced.
Preferably, the coarse aggregate is crushed stone with the particle size of 4-7 mm; the medium aggregate is crushed stone with the particle size of 1-3 mm; the fine aggregate is river sand with 50-80 meshes.
The particle size or mesh size of the coarse aggregate, the medium aggregate and the fine aggregate are all the preferred ranges of the application, and the self-compacting concrete prepared by the method has better self-compaction property and better structural stability after coagulation.
Preferably, the retarder is one or more of tartaric acid, citric acid, sodium lignosulfonate, sodium alginate and sodium gluconate.
The tartaric acid, the citric acid, the sodium lignosulfonate, the sodium alginate and the sodium gluconate are used for self-compacting concrete and have retarding effect. When one or more of tartaric acid, citric acid, sodium lignosulfonate, sodium alginate and sodium gluconate are adopted for compounding, the retarder can play a better role in retarding, the structural stability of self-compacting concrete after being coagulated is further improved, and the possibility of cracking is reduced.
Preferably, the water reducer is a polycarboxylic acid water reducer or a sulfamate water reducer.
The polycarboxylic acid water reducer or sulfamate water reducer can further improve the structural stability of the self-compacting concrete after coagulation.
In a second aspect, the application provides a method for preparing self-compacting concrete, which adopts the following technical scheme: and weighing coarse aggregate, medium aggregate, fine aggregate and cement according to parts by weight, uniformly stirring to obtain a mixture, weighing water, retarder, self-compacting admixture and water reducer, adding into the mixture, and uniformly stirring to obtain self-compacting concrete.
The preparation method is simple to operate and high in production efficiency, and the prepared self-compacting concrete is used for a bridge deck, so that the possibility of cracking and collapsing on the surface of the self-compacting concrete can be reduced, and the maintenance frequency of the self-compacting concrete is reduced.
In summary, the application has the following beneficial effects:
1. the self-compacting concrete slurry obtained by compounding the self-compacting admixture, the coarse aggregate, the medium aggregate, the fine aggregate, the cement, the water, the retarder and the water reducing agent has better fluidity, segregation resistance, self-filling property and the like, and after the self-compacting concrete slurry is used for curing a bridge, the formed bridge has stable structure, is not easy to crack and collapse, and reduces the maintenance frequency of the bridge deck.
2. Through inorganic filler, fibrous filler, organosilicon waterproofing agent and water complex, can further improve mobility, self-filling nature, the self-compaction nature of self-compaction concrete, when it was used in the bridge, the structure after the setting was more stable, and then reduced the bridge floor and appear cracking, collapse's possibility, reduced the frequency of bridge floor maintenance.
3. The self-compacting concrete has better self-compacting property by compounding the fly ash, the mineral powder and the silica micropowder, so that the structure of the self-compacting concrete after condensation is more stable, and the possibility of collapse and cracking is reduced.
Detailed Description
The present application will be described in further detail with reference to examples.
Source or performance parameters of part of the raw materials:
the particle diameters of the fly ash, the mineral powder and the silica micropowder are all 10-100nm;
the fineness of the banana fiber is 1-10 micrometers, and the length is 30-50 micrometers; sisal fibers have fineness of 0.1-5 micrometers and length of 10-50 micrometers; the fineness of the glass fiber is 1-10 micrometers, and the length is 10-30 micrometers;
the deacetylation amount of chitosan is 85-95%;
PVP with average molecular weight of 10000-50000.
Examples
Example 1
The preparation method of the self-compacting concrete comprises the following steps: weighing 60kg of coarse aggregate, 35kg of medium aggregate, 50kg of fine aggregate and 15kg of cement, and putting the coarse aggregate, the 35kg of medium aggregate and the 50kg of fine aggregate into a cement mixer to be uniformly stirred to obtain a mixture; and then 8kg of water, 0.2kg of retarder, 16kg of self-compacting admixture and 3kg of water reducer are sequentially added into a cement mixer, and uniformly stirred to obtain self-compacting concrete.
Wherein, the self-compaction admixture is obtained by the following steps: the weight ratio of the components is 1:1.8:2.5, weighing the fly ash, the mineral powder and the silica micropowder, and uniformly mixing to obtain an inorganic filler;
the weight (kg) ratio is 4.2:2.3:1, namely, uniformly mixing banana fiber, sisal fiber and glass fiber to obtain a fiber filler;
weighing 0.5kg of organosilicon waterproofing agent and 7kg of water, and uniformly mixing to obtain a diluent; and then adding 3.5kg of inorganic filler and 5kg of fibrous filler into the diluent in turn, and uniformly stirring to obtain the self-compacting admixture.
The coarse aggregate is crushed stone with the particle size of 4-7 mm; the medium aggregate is crushed stone with the grain diameter of 1-3 mm; the fine aggregate is river sand with 50-80 meshes.
The retarder is tartaric acid.
The water reducer is a polycarboxylic acid water reducer.
Example 2
Example 2 differs from example 1 in that: the self-compacting concrete has different raw materials, and is concretely as follows: 80kg of coarse aggregate, 50kg of medium aggregate, 65kg of fine aggregate, 16.5kg of cement, 12kg of water, 0.25kg of retarder, 20kg of self-compacting admixture and 3.5kg of water reducer.
Example 3
Example 3 differs from example 1 in that: the self-compacting concrete has different raw materials, and is concretely as follows: 100kg of coarse aggregate, 80kg of medium aggregate, 80kg of fine aggregate, 18kg of cement, 15kg of water, 0.3kg of retarder, 25kg of self-compacting admixture and 4kg of water reducer.
Example 4
Example 4 differs from example 2 in that:
the self-compacting admixture has different raw material compositions, such as: the inorganic filler is prepared from fly ash, mineral powder and silica micropowder according to the weight (kg) ratio of 1:2.1: 3.0; the fibrous filler is prepared from banana fiber, sisal fiber and glass fiber in a weight (kg) ratio of 5.5:2.8:1;0.7kg of organosilicon waterproofing agent, 11kg of water, 4.5kg of inorganic filler and 6.5kg of fibrous filler.
Example 5
Example 5 differs from example 2 in that:
the self-compacting admixture has different raw material compositions, such as: the inorganic filler is prepared from fly ash, mineral powder and silica micropowder according to the weight (kg) ratio of 1:2.5: 3.3; the fibrous filler is prepared from banana fiber, sisal fiber and glass fiber according to the weight (kg) ratio of 6.5:3.8:1;0.7kg of organosilicon waterproofing agent, 11kg of water, 4.5kg of inorganic filler and 6.5kg of fibrous filler.
Example 6
Example 6 differs from example 4 in that: the fibrous filler is treated with a surface treatment agent, the surface treatment steps being as follows:
mixing and stirring the surface treating agent and the fibrous filler in a ratio of 1:1 for 30min, filtering, and drying to obtain the surface treated fibrous filler.
The preparation method of the surface treatment comprises the following steps:
step 1: weighing 7.5kg of chitosan, putting the chitosan into a stirrer, adding N, N-dimethylformamide, stirring until the chitosan is completely dissolved, heating to 65 ℃, dropwise adding 1.5kg of salicylic acid while stirring at the rotation speed of 200r/min, reacting for 3.5h after the dropwise adding is completed, stopping stirring, standing for 30min, performing suction filtration, washing with absolute ethyl alcohol in the filtration process, and drying to obtain a salicylic acid-chitosan compound;
step 2: weighing 2.8kg of salicylic acid-chitosan compound obtained in the step 1 and 8kg of PVP solution with the mass fraction of 1.3, uniformly mixing, adding 1.8kg of N-aminoethyl-gamma-aminopropyl trimethoxysilane, and stirring for 15min to obtain the surface treating agent.
Example 7
Example 7 differs from example 6 in that: the raw materials are used in different amounts, and the preparation method of the surface treatment comprises the following steps:
step 1: weighing 10kg of chitosan, putting the chitosan into a stirrer, adding N, N-dimethylformamide, stirring until the chitosan is completely dissolved, heating to 70 ℃, dropwise adding 2.5kg of salicylic acid while stirring at the rotation speed of 200r/min, reacting for 4 hours after the dropwise adding is completed, stopping stirring, standing for 50 minutes, performing suction filtration, washing with absolute ethyl alcohol in the filtration process, and drying for 12 hours to obtain a salicylic acid-chitosan compound;
step 2: weighing 3.5kg of salicylic acid-chitosan compound obtained in the step 1 and 11kg of PVP solution with the mass fraction of 1.5%, uniformly mixing, adding 2.5kg of N-aminoethyl-gamma-aminopropyl trimethoxysilane, and stirring for 20min to obtain the surface treating agent.
Example 8
Example 8 differs from example 6 in that: the raw materials are used in different amounts, and the preparation method of the surface treatment comprises the following steps:
step 1: weighing 12kg of chitosan, putting the chitosan into a stirrer, adding N, N-dimethylformamide, stirring until the chitosan is completely dissolved, heating to 75 ℃, dropwise adding 3kg of salicylic acid while stirring at the rotation speed of 300r/min, reacting for 4.5 hours after the dropwise adding is completed, stopping stirring, standing for 60min, performing suction filtration, washing with absolute ethyl alcohol in the filtration process, and drying to obtain a salicylic acid-chitosan compound;
step 2: weighing 4.7kg of salicylic acid-chitosan compound obtained in the step 1 and 13kg of PVP solution with the mass fraction of 1.8%, uniformly mixing, adding 3.3kg of N-aminoethyl-gamma-aminopropyl trimethoxysilane, and stirring for 25min to obtain the surface treating agent.
Comparative example
Comparative example 1
Comparative example 1 differs from example 1 in that: the fibrous filler is replaced by an equal amount of inorganic filler.
Comparative example 2
Comparative example 2 is different from example 1 in that: the inorganic filler is replaced by fibrous filler in equal amount.
Comparative example 3
Comparative example 3 is different from example 1 in that: the organosilicon waterproofing agent is replaced by fibrous filler in equal quantity.
Comparative example 4
Comparative example 4 differs from example 1 in that: the inorganic filler is fly ash.
Comparative example 5
Comparative example 5 is different from example 1 in that: the fibrous filler is banana fiber.
Comparative example 6
Comparative example 6 differs from example 1 in that: the banana fiber is replaced with sisal fiber in equal amounts.
Comparative example 7
Comparative example 7 differs from example 6 in that; the surface treating agent is silane coupling agent KH560 and water is added in a ratio of 1:20.
Performance test
The self-compacting concrete obtained in examples 1 to 8 and comparative examples 1 to 7 was used for the following performance test.
Detection method/test method
1) The slump expansion degree is referred to JGJ/T283-2012, self-compacting concrete application technical Specification and GB/T50080-2016, common concrete mix Performance test method Standard.
2) Concrete mechanical property tests are carried out by referring to a concrete cube compressive strength test method in GB/T50081-2002 Standard of common concrete mechanical property test method, and concrete data are shown in Table 1;
TABLE 1 Experimental data for examples 1-8 and comparative examples 1-7
As can be seen from the combination of examples 1 and comparative examples 1 to 3 and Table 1, the compressive strength of each of the comparative examples 1 to 3 at the 7 th and 28 th days is smaller than that of example 1, which means that the self-compacting admixture obtained by compounding three kinds of fibrous filler, inorganic filler and organosilicon waterproofing agent can further improve the structural stability of self-compacting concrete and reduce the possibility of collapse and cracking after solidification.
Comparative examples 1 and 4-5, it can be seen that the compressive strength of comparative examples 4-5 on days 7 and 28 is less than that of example 1, demonstrating that the use of banana fiber, sisal fiber, and glass fiber composite, acting synergistically, enhances the structural stability of the concrete. The fly ash, mineral powder and silica micropowder are compounded to play a synergistic role, so that the structural stability of the concrete is enhanced.
Comparing the comparative example 7 with the example 6, it can be seen that the surface treating agent prepared by the application has better structural stability after being used for treating the filling fiber and the self-compacting concrete obtained after being coagulated, and reduces the possibility of cracking and collapsing.
The compressive strength of both the 7 th and 28 th days of example 4 was smaller than that of example 6, comparing example 4 and example 6, demonstrating that the fibrous filler treated with the surface treating agent can be better mixed with the raw material system of self-compacting concrete, improving its crack resistance and collapse resistance.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.

Claims (10)

1. The self-compacting concrete is characterized by comprising the following raw materials in parts by weight:
160-250 parts of self-compacting admixture
600-1000 parts of coarse aggregate
350-800 parts of medium aggregate
500-800 parts of fine aggregate
150-180 parts of cement
80-150 parts of water
Retarder 2-3 parts
30-40 parts of water reducer.
2. The self-compacting concrete according to claim 1, wherein the self-compacting admixture comprises the following raw materials in parts by weight:
35-55 parts of inorganic filler
50-80 parts of fibrous filler
5-10 parts of organosilicon waterproofing agent
70-105 parts of water.
3. A self-compacting concrete as set forth in claim 2 wherein: the inorganic filler is prepared from fly ash, mineral powder and silica micropowder in a weight ratio of 1 (1.8-2.5): (2.5-3.3).
4. A self-compacting concrete as set forth in claim 2 wherein: the fibrous filler is prepared from banana fiber, sisal fiber and glass fiber in a weight part ratio of (4.2-6.5): (2.3-3.8):1.
5. A self-compacting concrete as set forth in claim 4 wherein: the fibrous filler is subjected to surface treatment by a surface treating agent.
6. A self-compacting concrete as set forth in claim 5 wherein the surface treating agent includes the steps of:
step 1: according to parts by weight, 7.5-12 parts of chitosan is weighed and dissolved in N, N-dimethylformamide, the mixture is heated to 65-75 ℃, 1.5-3 parts of salicylic acid is dropwise added under stirring at the rotating speed of 200-300r/min, after the dropwise addition is completed, the reaction is carried out for 3.5-4.5 hours, the stirring is stopped, the mixture is kept stand for 30-60 minutes, the mixture is filtered, and the mixture is washed by absolute ethyl alcohol and dried to obtain a salicylic acid-chitosan compound;
step 2: according to the weight portions, 2.8 to 4.7 portions of the salicylic acid-chitosan compound obtained in the step 1 and 8 to 13 portions of PVP solution with the mass fraction of 1.3 to 1.8 percent are weighed and evenly mixed, and then 1.8 to 3.3 portions of N-aminoethyl-gamma-aminopropyl trimethoxysilane are added and stirred for 15 to 25 minutes to obtain the surface treating agent.
7. A self-compacting concrete as set forth in claim 1 wherein: the coarse aggregate is crushed stone with the particle size of 4-7 mm; the medium aggregate is crushed stone with the particle size of 1-3 mm; the fine aggregate is river sand with 50-80 meshes.
8. A self-compacting concrete as set forth in claim 1 wherein: the retarder is one or more of tartaric acid, citric acid, sodium lignosulfonate, sodium alginate and sodium gluconate.
9. A self-compacting concrete as set forth in claim 1 wherein: the water reducer is a polycarboxylate water reducer or a sulfamate water reducer.
10. A method of preparing self-compacting concrete according to any one of claims 1 to 9, comprising the steps of: and weighing coarse aggregate, medium aggregate, fine aggregate and cement according to parts by weight, uniformly stirring to obtain a mixture, weighing water, retarder, self-compacting admixture and water reducer, adding into the mixture, and uniformly stirring to obtain self-compacting concrete.
CN202310676771.1A 2023-06-08 2023-06-08 Self-compacting concrete and preparation method thereof Pending CN116573895A (en)

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